A hero military veteran jumped into action to take down a knife-wielding man threatening to stab shoppers at a South Carolina Walmart - by smashing him over the head with a metal pole. Video shows the unidentified man dressed in red hoodie swearing and shouting on the floor of the Walmart located in Columbia, SC demanding $20. The man is seen waving his knife yelling, 'I'm going to start cutting you all up,' as horrified bystanders stand by during the incident that took place on January 4th around 2pm. One of the store managers tried to confront the suspect, but...